Looking sweet !!! What size do you plan on putting in there ? Adults (5-6.5") you can easily do 10-12-15 depending on your other stock. Filtration plans for this one ?
3" are pretty small for a 150. Will require a lot of power feeding and WC's to get them up to 6-7". I like your thoughts of the canisters. I run Fluval on all mine and love them. May be a better choice for one FX6 and and then keep or lose the HOB. FWIW, no carbon.
Your 55 gal. looks amazing! I'm excited to see how your 150 gal. turns out. Tagging along!
I would like to start with 5 " Discus but there so expensive at that size. Thanks for the advice.